:root{
  --bg: #fbfbfe;
  --card: rgba(255,255,255,.75);
  --stroke: rgba(15,23,42,.12);
  --text: #0f172a;
  --muted: rgba(15,23,42,.65);
  --shadow: 0 10px 30px rgba(15,23,42,.08);
  --radius: 18px;
  --radius2: 14px;
  --pad: 14px;
  --accent1: #a7f3d0;
  --accent2: #c4b5fd;
  --accent3: #fbcfe8;
  --accent4: #bae6fd;
  --user: rgba(255,255,255,.85);
  --bot: rgba(255,255,255,.65);
  --focus: rgba(59,130,246,.35);
  --font: 21px;
}

body[data-theme="mint"]{ --accent1:#a7f3d0; --accent2:#c4b5fd; --accent3:#fbcfe8; --accent4:#bae6fd; }
body[data-theme="lavender"]{ --accent1:#ddd6fe; --accent2:#c7d2fe; --accent3:#f5d0fe; --accent4:#bae6fd; }
body[data-theme="peach"]{ --accent1:#fed7aa; --accent2:#fbcfe8; --accent3:#fde68a; --accent4:#bfdbfe; }
body[data-theme="sky"]{ --accent1:#bae6fd; --accent2:#c7d2fe; --accent3:#fbcfe8; --accent4:#a7f3d0; }

body[data-contrast="high"]{
  --stroke: rgba(15,23,42,.22);
  --muted: rgba(15,23,42,.78);
  --card: rgba(255,255,255,.92);
  --bot: rgba(255,255,255,.92);
  --user: rgba(255,255,255,.98);
}

body[data-text="large"]{ --font: 24px; }
body[data-mode="elder"]{ --font: 23px; }

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-size:var(--font);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color:var(--text);
  background:
    radial-gradient(1000px 600px at 20% 0%, var(--accent4), transparent 55%),
    radial-gradient(900px 600px at 80% 10%, var(--accent3), transparent 55%),
    radial-gradient(900px 700px at 35% 100%, var(--accent1), transparent 58%),
    radial-gradient(900px 700px at 95% 90%, var(--accent2), transparent 60%),
    var(--bg);
}

.app{
  height:100%;
  display:flex;
  flex-direction:column;
  max-width:1200px;
  margin:0 auto;
  padding:14px;
  gap:12px;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 14px;
  background:var(--card);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter: blur(10px);
}

.brand{ display:flex; align-items:center; gap:12px; }
.logo{
  width:50px;
  height:50px;
  border-radius:14px;
  object-fit:cover;
  border:1px solid rgba(255,255,255,.55);
  box-shadow: 0 6px 16px rgba(15,23,42,.08);
}
.brandText .title{ font-size:1.12em; font-weight:750; letter-spacing:.2px; }
.brandText .subtitle{ font-size:.9em; color:var(--muted); }

.controls{ display:flex; gap:10px; align-items:center; }
.seg{
  display:flex;
  padding:4px;
  border-radius:999px;
  background:rgba(255,255,255,.55);
  border:1px solid var(--stroke);
}
.segBtn{
  border:0;
  background:rgba(255,255,255,.55);
  padding:13px 18px;
  border-radius:999px;
  font-weight:750;
  font-size:1.02em;
  color:var(--muted);
  cursor:pointer;
  transition: all .18s ease;
}
.segBtn[aria-selected="true"]{
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  color:var(--text);
  box-shadow: 0 6px 18px rgba(15,23,42,.08);
}

.iconBtn{
  border:1px solid var(--stroke);
  background: linear-gradient(135deg, var(--accent4), var(--accent3));
  border-radius:14px;
  padding:13px 18px;
  cursor:pointer;
  color:var(--text);
  font-weight:800;
  font-size:1.02em;
}

.cutePanel{
  display:grid;
  grid-template-columns: minmax(320px, 1fr) minmax(360px, 1fr);
  gap:12px;
}

.botCard{
  display:flex;
  align-items:center;
  gap:14px;
  padding:14px;
  border-radius:var(--radius);
  border:1px solid var(--stroke);
  background:var(--card);
  box-shadow:var(--shadow);
}

.botAvatarLarge{
  width:96px;
  height:96px;
  border-radius:22px;
  object-fit:cover;
  border:2px solid rgba(255,255,255,.9);
  background:rgba(255,255,255,.8);
}

.botCardTitle{
  font-size:1.08em;
  font-weight:800;
}

.botCardSub{
  color:var(--muted);
  margin-top:6px;
  font-size:.9em;
}

.avatarPicker{
  display:flex;
  gap:10px;
  overflow:auto;
  padding:8px;
  border-radius:var(--radius);
  border:1px solid var(--stroke);
  background:var(--card);
  box-shadow:var(--shadow);
}

.avatarBtn{
  flex:0 0 auto;
  border:1px solid var(--stroke);
  background:rgba(255,255,255,.92);
  border-radius:16px;
  padding:8px;
  width:98px;
  cursor:pointer;
}

.avatarBtn[aria-selected="true"]{
  border-color: rgba(99,102,241,.45);
  box-shadow: 0 0 0 4px rgba(99,102,241,.15);
}

.avatarImg{
  width:100%;
  aspect-ratio:1/1;
  object-fit:cover;
  border-radius:12px;
}

.avatarName{
  display:block;
  margin-top:7px;
  font-size:.72em;
  font-weight:700;
  text-align:center;
}

.main{
  flex:1;
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height:0;
}

.chips{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.chip{
  border:1px solid var(--stroke);
  background:rgba(255,255,255,.72);
  padding:11px 16px;
  border-radius:999px;
  cursor:pointer;
  font-weight:650;
  font-size:.94em;
  color:var(--text);
}
.chip:hover{ filter:brightness(1.02); }

.chat{
  flex:1;
  min-height:0;
  overflow:auto;
  padding:12px;
  background:var(--card);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter: blur(10px);
}

.rowMsg{
  display:flex;
  margin:10px 0;
  align-items:flex-end;
  gap:10px;
}
.rowMsg.user{ justify-content:flex-end; }
.rowMsg.bot{ justify-content:flex-start; }

.msgAvatar{
  width:48px;
  height:48px;
  border-radius:14px;
  object-fit:cover;
  border:1px solid var(--stroke);
  background:rgba(255,255,255,.9);
}
.rowMsg.user .msgAvatar{ order:2; }
.rowMsg.user .bubble{ order:1; }

.bubble{
  max-width:min(680px, 92%);
  padding:14px 16px;
  border-radius:20px;
  border:1px solid var(--stroke);
  white-space:pre-wrap;
  line-height:1.5;
}
.rowMsg.user .bubble{
  background: linear-gradient(135deg, rgba(255,255,255,.95), var(--accent3));
  border-top-right-radius:10px;
}
.rowMsg.bot .bubble{
  background: linear-gradient(135deg, rgba(255,255,255,.95), var(--accent4));
  border-top-left-radius:10px;
}
.meta{
  margin-top:6px;
  font-size:.82em;
  color:var(--muted);
}

.composer{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap:10px;
  align-items:stretch;
  padding:14px;
  background:var(--card);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter: blur(10px);
}
#btnMic, #btnSpeakToggle, #btnClear{ min-width:0; width:100%; }

.input{
  width:100%;
  border:1px solid var(--stroke);
  border-radius:14px;
  padding:14px 14px;
  background:rgba(255,255,255,.9);
  outline:none;
  font-size:1em;
}
.input:focus{ box-shadow:0 0 0 4px var(--focus); }

.sendBtn{
  border:0;
  cursor:pointer;
  border-radius:16px;
  padding:14px 18px;
  font-weight:800;
  color:var(--text);
  background: linear-gradient(135deg, var(--accent4), var(--accent3));
  box-shadow: 0 10px 22px rgba(15,23,42,.10);
}
.ghostBtn{
  border:1px solid var(--stroke);
  background: linear-gradient(135deg, var(--accent4), var(--accent1));
  border-radius:16px;
  padding:16px 14px;
  cursor:pointer;
  color:var(--text);
  font-weight:800;
  font-size:1.08em;
}
.voiceBtn{
  border:1px solid var(--stroke);
  background: linear-gradient(135deg, var(--accent3), var(--accent2));
  border-radius:16px;
  padding:16px 14px;
  cursor:pointer;
  color:var(--text);
  font-weight:800;
  font-size:1.08em;
  min-width:0;
}
#btnMic{
  background: linear-gradient(135deg, var(--accent1), var(--accent4));
}
#btnSpeakToggle{
  background: linear-gradient(135deg, var(--accent3), var(--accent2));
}
.voiceBtn[data-recording="true"]{
  background: linear-gradient(135deg, #fca5a5, #fecaca);
  border-color: rgba(220,38,38,.35);
}
.voiceStatus{
  margin: -4px 4px 0;
  padding: 0 8px;
  min-height: 1.2em;
  color: var(--muted);
  font-size: .86em;
}
.voiceDiag{
  display: none;
}

.modal{
  position:fixed;
  inset:0;
  display:none;
  align-items:center;
  justify-content:center;
  padding:18px;
  background:rgba(15,23,42,.35);
}
.modal[data-open="true"]{ display:flex; }
.modalCard{
  width:min(560px, 96vw);
  background:rgba(255,255,255,.92);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.modalHeader{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 14px;
  border-bottom:1px solid var(--stroke);
}
.modalTitle{ font-weight:850; }
.form{ padding:14px; display:flex; flex-direction:column; gap:12px; }
.field .label{ font-weight:750; margin-bottom:6px; }
.help{ margin-top:6px; color:var(--muted); font-size:.9em; }
.select{
  width:100%;
  border:1px solid var(--stroke);
  border-radius:14px;
  padding:14px 14px;
  background:rgba(255,255,255,.95);
  outline:none;
  font-size:1em;
}
.row{ display:flex; gap:18px; flex-wrap:wrap; }
.toggle{ display:flex; align-items:center; gap:10px; color:var(--text); font-weight:700; }
.toggle input{ width:18px; height:18px; }
.modalFooter{
  display:flex;
  justify-content:flex-end;
  gap:10px;
  padding:14px;
  border-top:1px solid var(--stroke);
}
.primaryBtn{
  border:0;
  cursor:pointer;
  border-radius:16px;
  padding:14px 18px;
  font-weight:850;
  color:var(--text);
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  box-shadow: 0 10px 22px rgba(15,23,42,.10);
}

@media (max-width: 900px){
  .cutePanel{
    grid-template-columns:1fr;
  }
}

@media (max-width: 640px){
  .app{ padding:12px; }
  .controls{ gap:8px; }
  .iconBtn{ padding:11px 13px; font-size:.95em; }
  .segBtn{ padding:11px 13px; font-size:.95em; }
  .composer{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ghostBtn,.voiceBtn,.sendBtn{ padding:12px 12px; }
  .input{ order: 5; width:100%; }
}

/* 5-inch kiosk tuning (typical 800x480 / 854x480) */
@media (max-height: 600px), (max-width: 900px) {
  :root { --font: 18px; }
  body[data-text="large"] { --font: 20px; }
  body[data-mode="elder"] { --font: 19px; }

  .app {
    padding: 8px;
    gap: 8px;
  }

  .topbar {
    padding: 10px;
    border-radius: 14px;
  }

  .logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
  }

  .brandText .title { font-size: 1em; }
  .brandText .subtitle { font-size: .85em; }

  .segBtn {
    padding: 9px 12px;
    font-size: .9em;
  }

  .iconBtn {
    padding: 9px 12px;
    border-radius: 12px;
    font-size: .9em;
  }

  .cutePanel {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .botCard {
    padding: 10px;
    gap: 10px;
    border-radius: 14px;
  }

  .botAvatarLarge {
    width: 70px;
    height: 70px;
    border-radius: 14px;
  }

  .botCardSub {
    margin-top: 2px;
    font-size: .85em;
  }

  .avatarPicker {
    padding: 6px;
    gap: 8px;
    border-radius: 14px;
  }

  .avatarBtn {
    width: 78px;
    padding: 6px;
    border-radius: 12px;
  }

  .avatarName {
    margin-top: 4px;
    font-size: .65em;
  }

  .chips {
    gap: 6px;
  }

  .chip {
    padding: 7px 10px;
    font-size: .82em;
    border-radius: 999px;
  }

  .chat {
    padding: 8px;
    border-radius: 14px;
  }

  .rowMsg {
    gap: 8px;
    margin: 8px 0;
  }

  .msgAvatar {
    width: 38px;
    height: 38px;
    border-radius: 10px;
  }

  .bubble {
    padding: 10px 12px;
    border-radius: 14px;
    line-height: 1.4;
  }

  .composer {
    padding: 8px;
    gap: 8px;
    border-radius: 14px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .ghostBtn,
  .voiceBtn {
    width: 100%;
    min-width: 0 !important;
    padding: 12px 6px;
    border-radius: 12px;
    font-size: .92em;
  }

  .voiceStatus {
    margin: -2px 2px 0;
    font-size: .8em;
    min-height: 1em;
  }
  .voiceDiag { display: none; }
}